iPhone6 plus fixes

[twobitfool]

Fixes for #118, #119, and #120.

[cubiq]

we don't know how ios9 and 10 will work, now it works on the emulator but tomorrow who knows. What happens when OSX goes to 11? or when iOS to 10?

I believe we should better detect the simulator.

[twobitfool]

Regardless of #120, I think it might be good idea to include the extra CSS rules.

If the buttons don't move in iOS v9 or v10, then everything will "just keep working", and we save everyone the trouble of patching their addtohomescreen.css to get the same behavior.

Fixing the simulator is just a nice side-effect of supporting future versions of iOS ;)

[cubiq]

I kinda agree but to date, all iOS versions needed a CSS update.

[twobitfool]

Another approach might be to have some logic in the js file to add a class like ios-8-plus. Then everything works until Apple eventually moves the buttons -- and then we add a new rule ios-13-plus to override the position moving forward.

[alexonbalangue]

I tested on my iPhone 6 iOS 9.x (lastest) it work well done
https://www.alexonbalangue.me/project/developper/module-addhome-ios-android-joomla.html